Process of waxing paper.



F. H. HOBERG.

PROCESS 0F WAXING PAPER.

APPLICATION FILED IAII.6. I9Ia.

Patented Jan. 11, 1916.

@Lvl/imaxes FRANK H. H oBERG, or GREEN BAY, WISCONSIN.

PROCESS 0F WAXING PAPER.

memos..

Specication of Letters Patent. v

l Application filed January 6, 1913. Serial No. 740,367.

To all 'whom it may concern.'

Be it knownthat I, FRANK H. Honno, a citizen of the UnitedV States, residing at Green Bay, county of Brown, and State of Wisconsin, have invented'new 4and useful Improvements in Processes of Waxing Paper, of which the, following is a speciiication. l' I My invention relates to improvements in processes of waxlng paper. The general practice heretofore has been to .discharge melted wax through a perforated cylinder upon the paperafter the process ofmanufacturing the paper has been completed. This hasresulted in an unequal distribution of the wax, it being necessary to wind the paper upon a roll. immediately after such a waxing operation and it has been found to frequently adhere to the superposed paper in the roll, whereby it becomes virtually impossible to unwindthe roll without tearing portions of the paper which have adhered to other portions beneath it.

The objects of my invention are to secure an equal and uniform distribution of the wax, reduce the expense of manufacturing wax paper by combining the waxing process with thc paper manufacturing process and also to secure a thorough absorption of the wax preparatory to winding the paper upon the receiving roll, thus avoiding adhesion.

In the accompanying drawing which illustrates the practice of my improved process I have shown two drying rolls of a paper manufacturing machine of ordinary type, one of said rolls being shown in side elevation and the other in cross section, and each equipped with apparatus to facilitate the carrying out of my process. My invention is based upon the discovery that by waxing the surface of the dryingrolls of a paper making machine the wax can be distributed to the paper uniformly and effectively and the heat of the rolls will dry the paper so that is can absorb the wax and be delivered from the rolls in a condition to be wound upon a receiving roll without sticking, the waxed paper being smooth, dry and hard as it comesfrom the drying rolls.

In the drawing A and B represent two rotary drying rolls of a paper making machine.I These rolls in the machines in ordinary use, are located between the press rolls and the calendering rolls.

d, d are guidev rolls over which a flexible apron C extends, said apron passing underneath the drying rolls A and B as shown. Other guide rolls e, e are employed over which the strip of paper F passes, said paper being thus interposed between the apron C and the drying rolls and carried 1n pressure Contact witheach of thel drying rolls 1n passing from a roller e to the succeeding roller e. The drying rolls are lledf with steam which is .delivered thereto through hollow trunnions G. Y

By applying a cake of wax to one or all of the drying rolls immediatelyabove the point where such roll receives 'the strip F of paper the surface of the drying roll may' be covered with a thin coating of melted wax which, on coming in contact with the paper, immediately penetrates the latter and distributes throughout -the tissue, after which the contact of the drying roll with the paper is sufficiently prolonged to expel any remaining moisture and permit complete absorption of the wax, whereby as the waxed paper leaves the drying roll the paper is firm and the wax hard. By thus simultaneously waxing and drying the paper, I am enabled to utilize the moisture in the paper and the water vapor produced by its evaporation to not only prevent the paper from adhering to the drying roll, but also to facilitate hardening the wax. The wax is not only pressed into the paper and dried, but it is steamed during the initial stages of the process owing to the vaporation of the water carried by the paper.

To facilitate applying the wax I employ a pan I upon which the wax may be supported in a position to slide by gravity against'the drying roll A. The cake of wax will have a length equal to the strip of paper to be waxed and will therefore coat the entire surface of the drying roll which contacts with such paper. The pan I is preferably hinged at J and is adapted to oscillate between stops K whereby it may be tilted to the positioniin which one of the pans is shown in dotted lines, when it is not desired to use the wax. I also employ a retaining arm L the extremity of which is elbowed at ll/I in a position to be interposed between the wax and the roll preparatory to tilting the pan to the dotted line position. This arm L will also be supported to bind upon the pivot pin J suiiiciently to remain in any position in which it may be adjusted.

When the paper 1s being waxed this retainrarement aangii, raie..

in passing newly ing arm L will be out of contact with the cake of wax but when it is desired to stop the delivery of Wax the arm L will rst be swung downwardly until the elbowed extremity M passes between the wax and the drying roll, after which the pan I may be lifted and swung to the dotted line position.

1. That process of making water-proof paper which consists in simultaneously expelling the moisture from newly made paper and impregnating the paper with waterproof material.

2. The process of waxing paper consisting made moist paper over a rotating drying roll in pressure contact therewith and simultaneously waxing the ing 1n applying wax to the paper during the manufacture thereof and during the final drying operation, and simultaneously spreading the wax and compressing the wax and the paper under the influence of heat and for a suficient period to expel the moisture and simultaneously effect absorption of the wax.

In testimony whereof I aiix my signature in the presence of two witnesses FRANK H. HOBERG. Witnesses: GEO. A. RICHARDSON, FRANCES K. Srmss. 

